ATU: Chronically Injured In Ultrarunning and Solutions, Strengthening Upper-Body Run Mechanics, MAF for MTB? And More!

We are joined by Lucho for this addition of Ask the Ultrarunner featuring answers to your questions on:--If you had the chance to train a chronically injured athlete such as Anton Krupicka, how would you change their training given their injury history to make them stronger/less injury prone? Lifting? Cross training?-Upper body mechanics in running and suggestions for upper body strengthening that's beneficial particularly for distance running?-Long run volume during a 6-week gap between two ultras?-The back to back long runs or single long run in training for a 100 miler. What is sufficient?-Ultra mountain bike training: how to combine MAF and tempo/intervals for the race in ~4 months?-If your 'A' race is 11 weeks away (Badwater) and you have a 145 mile race booked before that should you do the 145-miler or skip it?-Hill training for ultras: short/steep hill repeats or long extended climbs/decents?-And More!